Drill press



1. ECKHAVRD. DRILL PRESS. APPLICATION FILED APR- 8, 192|.

Patented Aug; 15, 1922i VIC 9, lof

17 I IIIIIIIIIIIIIIIIII Y fIIIIV IIIII fry' d Melilla/I whey.

JOHN Eenmaal), or BUFFALO, NEW YORK.

DRILL Pn'ess;

Applicationfiled. April 8, 1921. Serial No. 459,525'. v

To all whom t may concern;

Be it known that I, JOHN EOKHARD, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New -York, have `invented certain new and vuseful improvements in Drill Presses, of

which the following is a specification.

` This invention relates to improvements in drill presses, and more particularly to the.

frame work thereof.V

In the larger sizes of drill presses,.the tool-spindle is subjected to sufficient pres-` sure when feeding the tool into a work-piece to cause flexing of the frame and thereby create a bending stress of the main column which causes a fluctuation in the degree of accuracy in the operation to an extent that is harmful for theffiner class of work, such as die work,y the making of machine tools, etc. .f v

The primary object of my invention is to provide a drill press with a comparatively light frame having forwardly and rear wardly proj ectingv i Overhanging portions;

and to provide the' frame with means where-- by the upward thrust on the forwardly-pro-;

jecting overhanging-portion caused by the feed pressure, is counteracted 'or resisted, the rearwardly-projecting overhanging-portion of the frame being .braced or supportedto absolutely yprevent flexing of the main column.r

A- further object of my invention is to provide a machine of this type iny which the means employed to counteract the upward 4thrust produced from feed pressure is adjustable so that when assembling the parts of the machina. the drill spindle may be accurately alinedA with the axis of the worktable and so that the position of the parts will be maintained to assure accurate work at all times.

.A furthervobject is to provide a Vframe comprising two sections, one mounted on and secured to the other by a single pointy connection and hz ving forwardlyand rearwardly projecting overhanging portions from. said point of connection and means for adjusting .said overhanging-portions and maintaining their adjustments;

With the above and other objects in view,

i my inventionv consists in the novel features of construction and in thearrangement and combinationy ofparts to be hereinafterdescribed and more particularly pointed out in the subjoined claims, f

.in the drawingsz.- i,

Fig' l is a Side elevatollllorf ardrill Press embodying my invention.

. Fig. 2 is a broken enlarged vertical sec- Specification of Letters Patent. Patnfedf A`1`1g115, 1922. f

tion through the rear brace column and-the p.

adjacent parts to which of are connected.

Fig. 3 is .an enlarged transverse section taken on. line 8-3, Fig.

Similar numerals `r-areused to designatey similar parts throughout the drawings rihe numeral '4e designates the frameconopposite ends theresidered as a. whole, said frame comprising a base 5, a standard ormaincolumn ,6, and a headv 7 bolted yor otherwise -secured to the vstandard or main column. 6 vby means :of

bolts 8, or otherwise.. The head Zhas affory wardly-projecting 'overhangingportion 9r andv a rearwardly-projecting overhangingportion 10, the forwardly overhanging-portion having twov vertically alined bearings 11 in which the drill spindle 12 is journaled,

and a horizontal 4bearing 13 in which one.`

end of a counter-shaft 14g is journaled,y they other endl ofsaid counter-shaft being jour-- naled in a bearing lprovided at therear end ofthe rearwardlyprojecting overhang uprights is journal-ed the main shaft 2O of the machine which extends rearwardly y through the rear'bearing upright 19 and has j aloose pulley 21 thereon and a driving pull j f bearingvv upleyr22 secured thereto in anysuitable man- 4 nel.

rangement or other device, the belt (not` shown) adapted to drive saidy vmainshaft may be shifted from the loose tor the-tight pulley, or reversely, and as theI shifting means for this purpose forms no part of .105 f I. do not consider it-necessary to illustrate ,y

inyinvention andmay'wbe variously applied,

the same in detail.

On the main shaft By means of` a pedal and rod ar-y g is a4 cone pulley 23,.A and alined therewith on the counter y shaftf- 111 is a reversed cone pulley 24, aloelt{not}` shown) being passed Iaround both cone pulleys and being applied and operateduin the usual manner to drive the countershaft from the main shaft.

At the rear end of the rearwardly-project-ing overhanging-portion 10 is a depending Aportion 25 having' its lower end turned down to cylindrical form, as at 23, to form a stud, the depending portion being;` provided with a beveled shoulder 27, for a purpose to appear hereinafter.

The rear bearing,` upright 19 is provided with a socket member in the form of an upward extension 28 having a socket 29 formed therein, vsaid socket being counterbored, as at 30.

The head 7 of the frame is secured between its ends to the main column by what I term a single-point connection; the contactinp; faces of said connection being` machined, but since the slightest inaccuracy in this connection will throw the drill spindle out of proper position, l employ what I term a brace column 31, which is tubular and comparatively slender. The upper end of this brace receives the stud 26 on the depending; portion of the head 7, and the upper edge thereof is flared, as at l32, to conform to the beveled shoulder 27 formed on said depending portion. Said stud is provided centrally with a downwardly opening slot 33, and a retainer pin 34 is passed through the walls of said brace column and through the slot 33 to prevent rotation of said brace column. By arranging the lpin 34: Within the slot 33, the upper endof the brace column may be forced firmly against the beveled shoulder 27.

Driven into the lower end of said tubu-` lar brace column is a reinforcing' and guide' .passed through said tubular column and through said plugs, as clearly shown in Fig.

3. The reinforcing and Q'uide plug 35 eX- tends from the lower end of said tubular column and the exterior of said tubular column is screw-threaded, as at '37. The depending' portion of said reinforcing; and ,guide plug" is entered in the lower or smaller portion of the socket 29 and has a guiding lit therein, while the lower end of the tubular column is entered in the counterbored portion 30of said socket, said counterbored portion being;` of slightly lgreater diameter than the exterior diameter of said column.

Threaded onto the lower portion of said vtubular column is an adjustin gfnut 38, which bears against the upper end of the sockety member 28 on the bearing; upright 19. By means of said nut, the base columnrcan be forced upwardly against the beveled shoulder on the dependingportion 25 yof the', head 7, with proper pressure to main- V tain the drill spindle 12 in proper alinement with the axis of the work table 17, and said column will counteract or resist any upward thrust created by the upward pressure of the drill spindle caused when operating upon a work piece. W ith the adjusting nut 38 properly adjusted, it is locked in place by means of a lock nut 39, also threaded on the lower threaded end of said brace column and bearing against said adjusting nut. Any play or looseness at the ends of the tubular brace column that may be caused by continual and long use of the machine can thereby be easily taken up by means of the adjusting nut 38.

By means of the arrangement described, all bending stress is removed from the main column, due to the counter-acting resistance offered by the brace column, the brace column beinp; situated directly opposite the drill spindle and having its ends fastened to the rear extremity ofthe frame and eX-` tended base, as clearly shown in Fig'. 1.

The application of this improved brace column or back column, as it may be termed, equips the machine or frame with a counter-acting; force which cannot be varied by the feed pressure against a work piece, and therefore the degree of accuracy at the spindle is incapable of variance.

Having; thus described my invention, what l cla-im is:

1. A drill. press having` a frame provided with a rearwardly-projecting portion at its upper end and a rearwardly-extending portion at its lower end, a pair of bearinguprights secured to said rearwardly-extending portion, one of said bearings having` an upwardly opening socket formed therein, a drive ,shaft journaled in said bearing' upright-s, and a tubular brace column having connection at its upper end with said rearwardly-projecting` portion and its lower end externally threaded and entered in said upwardly opening socket, and a nut threaded onto externally threaded lower end and bearing' against the upper end of the bearingr upright having# said socket therein.

A drill press comprising a frame havinn; a base provided with a rearwardlyextending; portion, a main column rising from said base and a head secured to said main column and provided with a rearwardly-projecting' portion alinedfwith the rearwardlv-eXt-endinga portion of said base, a comparatively slender column secured at its upper end to the extremity of the rearwardly-projecting portion of said head` and a socket member on the rearwardly-eXtend ing; portion of said base, the lower end of said slender column being adjustable in said socket member.

3. A. drill press comprising a frame having; a rearwardly-projectingV portion at its top and a rearwardly-eXtending` portion at its bottom, a column having' a partof said rearwardly-projecting portion 'entered in its upper end, and a socket member rising from said rearwardly-extending portion at the bottom of said frame and having. the lower end of saidk column adjustable therein. p

4. A drill press comprising a `frame having a base and a head provided with a rearwardly-projecting overhanging-portion, said overhanging-portionA having a downwardlyfacing beveled shoulder and a stud depending from said shoulder and provided with a pin slot opening at its lower end, a tubular column connecting said head with said base and having said stud entered into the upper end thereof, the upper edge of said tubular column being iared to fit the beveled shoulder of said head, and a pin extending through the tubular column and the slot of said stud.

5. A drill press comprising a frame having a base, a main column provided with a head at its upper end.` having a rearwardlyprojecting loverlianglng-portion, a socket lmember secured to said base in rear of said main column, said socket member having its socket counterbored7 a second and smaller column parallel with said main column having its upper end connected to the rearwardly-projecting overhanging-portion `of said head and its lower end externallyl guided in the smaller portion of said socket v and the'lower extremity of the threaded end of said column entering the counter-bore of said socket, and a nut threaded ontothe eX- ternally threaded lower end of said tubulark column and bearing against said socket member.

6. A drill press comprisinga frame hav-A socket member having a bore into which the lower endv of said plug slidably its'and having a counter-bore loosely receiving, the

lower end of said tubular member, an lady justing nut threaded onto said tubular member and bearing against said socket member,

and a jam nut also threaded .on vsaid tubular-'member and bearing against .saida'djusting nut.

. In testimony whereof Iaxmy signature.` i I l JOHN ECKHARD. 

